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ProGuard is a free shrinker, optimizer, obfuscator, and preverifier for Java bytecode
There is a newer version: 7.6.0
/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import proguard.classfile.ClassPool;
import proguard.classfile.util.ClassUtil;
import proguard.classfile.visitor.ClassVersionSetter;
import proguard.pass.Pass;

import java.io.IOException;
import java.util.*;

/**
 * This pass sets the target version on program classes.
 *
 * @author Eric Lafortune
 */
public class Targeter implements Pass
{
    private static final Logger logger = LogManager.getLogger(Targeter.class);
    private final Configuration configuration;

    public Targeter(Configuration configuration)
    {
        this.configuration = configuration;
    }


    /**
     * Sets the target version on classes in the given program class pool.
     */
    @Override
    public void execute(AppView appView) throws IOException
    {
        logger.info("Setting target versions...");

        Set newerClassVersions = configuration.warn != null ? null : new HashSet();

        appView.programClassPool.classesAccept(new ClassVersionSetter(configuration.targetClassVersion,
                                                                      newerClassVersions));

        if (newerClassVersions != null &&
            newerClassVersions.size() > 0)
        {
            logger.error("Warning: some classes have more recent versions (");

            Iterator iterator = newerClassVersions.iterator();
            while (iterator.hasNext())
            {
                Integer classVersion = (Integer)iterator.next();
                logger.error(ClassUtil.externalClassVersion(classVersion.intValue()));

                if (iterator.hasNext())
                {
                    logger.error(",");
                }
            }

            logger.error(")");
            logger.error("         than the target version ({}).", ClassUtil.externalClassVersion(configuration.targetClassVersion));

            if (!configuration.ignoreWarnings)
            {
                logger.error("         If you are sure this is not a problem,");
                logger.error("         you could try your luck using the '-ignorewarnings' option.");
                throw new IOException("Please correct the above warnings first.");
            }
        }
    }
}